4f4c4942-4343-5764-6473-313234393232 English Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en 2025-03-17T11:37:45.404Z NRW 1.0 wel Latitude and Longitude (EPSG::4326) Rumney Great Wharf to River Usk Drone Survey 2021 Rumney Great Wharf to River Usk Drone Survey 2021 Arolwg Drôn Cei Mawr Rhymni i Afon Wysg 2021-03-01 NRW_DS124922 Natural Resources Wales (NRW) wish to establish a topographical baseline and aerial imagery of the foreshore and surrounds to help inform the consideration of possible nature-based solutions at this location. The purpose of the survey was to collect topographic data of the foreshore, along the 12km frontage that stretches between Cardiff in the west and Newport to the east. Vertical images were taken for the photogrammetric reconstruction. Flights were also undertaken to capture oblique imagery looking back at the coastline. A key constraint of this survey was being unable to take GPS points out in the mudflats. To overcome this, a RTK capable drone was used, which reduces the reliance on ground control points by ensuring that the geolocation for each image is significantly more accurate than on a standard drone. The survey was carried out over a period of 6 days between the 3rd and 12th of February 2021. Flights were planned to ensure lowest possible tides. In total, 19 flights were completed to collect the aerial data, taking a combined 285 minutes (4.75 hours). Survey deliverables comprised ASCII Grid, Orthophotos and Obliques Natural Resources Wales (NRW) wish to establish a topographical baseline and aerial imagery of the foreshore and surrounds to help inform the consideration of possible nature-based solutions at this location. The purpose of the survey was to collect topographic data of the foreshore, along the 12km frontage that stretches between Cardiff in the west and Newport to the east. Vertical images were taken for the photogrammetric reconstruction. Flights were also undertaken to capture oblique imagery looking back at the coastline. A key constraint of this survey was being unable to take GPS points out in the mudflats. To overcome this, a RTK capable drone was used, which reduces the reliance on ground control points by ensuring that the geolocation for each image is significantly more accurate than on a standard drone. The survey was carried out over a period of 6 days between the 3rd and 12th of February 2021. Flights were planned to ensure lowest possible tides. In total, 19 flights were completed to collect the aerial data, taking a combined 285 minutes (4.75 hours). Survey deliverables comprised ASCII Grid, Orthophotos and Obliques Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en JBA Consultancy JBA Consulting, 1 Belle Vue Square, Broughton Road, Skipton, BD23 1FJ andrew.gubbin@jbaconsulting.com https://www.jbaconsulting.com/ Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Soil GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme drone survey saltmarsh (salt-marsh) (salt marsh) coastal erosion erosion rates NRW Thesaurus 2025-01-08 geonetwork.thesaurus.local.theme.converted_nrw-keywords SeaDataNet Parameter Discovery Vocabulary 2024-06-19 geonetwork.thesaurus.external.theme.rdf+xml IPSV Subjects List 2020-11-18 geonetwork.thesaurus.external.theme.subjects NRW SMNR Keywords 2024-06-26 geonetwork.thesaurus.local.theme.converted_nrw-smnr-keywords There are no access restrictions on this data. NRW may release, publish or disseminate it freely. no limitations © CNC/NRW Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose. Attribution statement: Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. English geoscientificInformation SeaVoX Vertical Co-ordinate Coverages 2021-01-06 Severn Estuary -3.11117 -3.04548 51.49095 51.51534 2021-02-03 2021-02-12 Armstrong, S., Whitehead, P., Scott, C., Hull, S., 2021. Rumney Great Wharf Saltmarsh Restoration / Enhancement Feasibility and Preferred Option Studies. Produced by ABPmer for NRW. NRW Evidence Report No: 528, 96pp, NRW, Cardiff Geographic Information System A] ASCII Grid Digital Elevation Model at 0.5m resolution. (Also full capture resolution at least 10cm resolution) B] Orthophoto (.tiff) at 5cm resolution C] Oblique Imagery of the shoreline D] Survey report in pdf format. Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 This dataset has not been assessed for conformance to the referenced INSPIRE regulation. false The following survey equipment was used for the survey: • Trimble GNSS Rover • DJI Phantom 4 RTK (x2) The DJI Phantom 4 RTK was selected as it has a built in RTK GNSS receiver. This enables a higher accuracy of data capture, particularly in areas where ground control points are not possible, such as the mudflats of this survey. A Trimble GNSS Rover connected to the VRS network receiving RTK corrections was used to collect control points for this survey. The GNSS Rover collects points to a level of 1-2cm accuracy depending on atmospheric conditions. A total of 87 Ground control points were collected for use in the processing of this data set. Where safe to do so, control points were taken at the interface between the salt marsh and the mud. A key constraint of this survey was being unable to take GPS points out in the mudflats. To overcome this, we selected a RTK capable drone, which reduces the reliance on ground control points by ensuring that the geolocation for each image is significantly more accurate than on a standard drone. In total, 19 flights were required to complete the survey. These were undertaken from the coastal path and on the salt marsh where possible. Automated flight plans were used to ensure consistent data coverage. These flights were flown in a ‘lawnmower’ pattern with an overlap of 70% and sidelap of 80%, ensuing high quality outputs in the post processing. Flights were conducted at the maximum altitude of 120m. A total of 5,942 vertical images were taken for the photogrammetric reconstruction. Flights were also undertaken to capture oblique imagery looking back at the coastline. The following survey equipment was used for the survey: • Trimble GNSS Rover • DJI Phantom 4 RTK (x2) The DJI Phantom 4 RTK was selected as it has a built in RTK GNSS receiver. This enables a higher accuracy of data capture, particularly in areas where ground control points are not possible, such as the mudflats of this survey. A Trimble GNSS Rover connected to the VRS network receiving RTK corrections was used to collect control points for this survey. The GNSS Rover collects points to a level of 1-2cm accuracy depending on atmospheric conditions. A total of 87 Ground control points were collected for use in the processing of this data set. Where safe to do so, control points were taken at the interface between the salt marsh and the mud. A key constraint of this survey was being unable to take GPS points out in the mudflats. To overcome this, we selected a RTK capable drone, which reduces the reliance on ground control points by ensuring that the geolocation for each image is significantly more accurate than on a standard drone. In total, 19 flights were required to complete the survey. These were undertaken from the coastal path and on the salt marsh where possible. Automated flight plans were used to ensure consistent data coverage. These flights were flown in a ‘lawnmower’ pattern with an overlap of 70% and sidelap of 80%, ensuing high quality outputs in the post processing. Flights were conducted at the maximum altitude of 120m. A total of 5,942 vertical images were taken for the photogrammetric reconstruction. Flights were also undertaken to capture oblique imagery looking back at the coastline.